diff --git a/README.md b/README.md
index cb8a19f..1230354 100644
--- a/README.md
+++ b/README.md
@@ -12,6 +12,10 @@ Usually, a program expects input on stdin,
 and produces output on stdout.
 Flags are sparse by design.
 
+Fluffy source code is purposefully spartan and easy to audit.
+Forks are encouraged,
+please let me know if you make one.
+
 
 How To Build
 ------------
@@ -114,6 +118,15 @@ Removes duplicate frames from input,
 writing to output.
 
 
+### hex: hex-encode input
+
+The opposite of `unhex`.
+
+The following is the equivalent of `cat`:
+
+    hex | unhex
+
+
 ### printfesc: printf escape input
 
 Reads octets,
diff --git a/hex.c b/hex.c
new file mode 100644
index 0000000..4097a22
--- /dev/null
+++ b/hex.c
@@ -0,0 +1,22 @@
+#include <stdio.h>
+
+int
+main(int argc, char *argv[])
+{
+	size_t count;
+
+	for (count = 0; ; count += 1) {
+		int c = getchar();
+
+		if (EOF == c) {
+			break;
+		}
+		printf("%02x ", c);
+		if (7 == count % 8) {
+			putchar(' ');
+		}
+	}
+	putchar('\n');
+
+	return 0;
+}